19 Jun '14 14:47>1 edit
People falsely accused of starting fires:
http://www.today.com/video/today/55451431
http://www.today.com/video/today/55451431
Originally posted by RBHILLWell yes. I'd make the point that he was prosecuted on the basis of that evidence alone, which is surprising. I wonder how many tests they did to establish their claim that a V-shaped burn mark is only associated with the presence of an accelerant.
People falsely accused of starting fires:
http://www.today.com/video/today/55451431
Originally posted by Grampy BobbyStart here:
An area I lack knowledge in is the Van Allen Belts in the earth's upper atmosphere. What function do they perform?
Originally posted by Grampy BobbyThe apparent function they perform is to keep orbiting manned vehicles from taking up long term residence at the altitudes where the radiation belt resides.
[b]People's lack of knowledge of Science
An area I lack knowledge in is the Van Allen Belts in the earth's upper atmosphere. What function do they perform?[/b]
Originally posted by sonhouseDo these belts in any way affect the temperature of the earth's immediate atmosphere or content of the air we breathe?
The apparent function they perform is to keep orbiting manned vehicles from taking up long term residence at the altitudes where the radiation belt resides.
The ISS has to use orbits much lower than the Van Allen belts or they would be fried with radiation, a LOT of radiation.
That has the effect of requiring a lot of fuel onboard to periodically fi ...[text shortened]... gence behind the radiation belts. That would be like wondering what is the function of sunspots.
Originally posted by twhiteheadLike he said, pretty close to zero interaction with the atmosphere, but there still is stuff up there, better vacuum than I get at work, right now 9 E-8 torr, a very good vacuum for industrial purposes but the vacuum up there is like minus 14 torr or so, a million times better a vacuum than we can make in standard industrial uses. Don't quote me but I think the big boys, like at Cern don't get much better than E-12 maybe E-13 level, which is still 100 times more populated than up there a few hundred miles high. And they manage to do cutting edge physics at that level so the vacuum up 500 miles to 1000 miles up, which is prime Van Allen territory, there is much less stuff there and if anything, the stuff from the lower atmosphere would tend to contaminate IT, not vice versa.
Not in any significant way.
Originally posted by sonhouseWhat does this "minus 14 torr or so, a million times better a vacuum than we can make in standard industrial uses." suck?
Like he said, pretty close to zero interaction with the atmosphere, but there still is stuff up there, better vacuum than I get at work, right now 9 E-8 torr, a very good vacuum for industrial purposes but the vacuum up there is like minus 14 torr or so, a million times better a vacuum than we can make in standard industrial uses. Don't quote me but I think ...[text shortened]... d if anything, the stuff from the lower atmosphere would tend to contaminate IT, not vice versa.
Originally posted by Grampy BobbyA lot of things. Most notably, the sun and plants. The sun is responsible for practically all the heat, and plants for the oxygen we breathe. But obviously there is a lot more to it than that. Without knowing what specifically you are interested in, I can't really help. You could look up 'climate', and 'atmosphere' on wikipedia.
What then does "affect the temperature of the earth's immediate atmosphere or content of the air we breathe"?
Originally posted by Grampy BobbyYeah, the way industrial vacuum goes, there is a level of vacuum that goes from zero to about about 30 inches of mercury, that's where in a column of mercury where it is in a u shaped tube say three feet high on both necks, and you put mercury in it and pump down one side of the tube while the other side is open to atmosphere, the more you pump out the one side the more the mercury moves from where it was level between the two tubes to higher up on the side that is being pumped.
What does this "minus 14 torr or so, a million times better a vacuum than we can make in standard industrial uses." suck?
Originally posted by twhiteheadtwhitehead, my interest in this context is learning what mechanisms [for lack of a better word] make earth habitable.
A lot of things. Most notably, the sun and plants. The sun is responsible for practically all the heat, and plants for the oxygen we breathe. But obviously there is a lot more to it than that. Without knowing what specifically you are interested in, I can't really help. You could look up 'climate', and 'atmosphere' on wikipedia.
Originally posted by sonhousePlease realize that I'll have to ponder your reply since my frame of reference for technical terminology is limited. Thanks.
Yeah, the way industrial vacuum goes, there is a level of vacuum that goes from zero to about about 30 inches of mercury, that's where in a column of mercury where it is in a u shaped tube say three feet high on both necks, and you put mercury in it and pump down one side of the tube while the other side is open to atmosphere, the more you pump out the one ...[text shortened]... n that, -3 level.
So that's the skinny on high vacuum, hope it doesn't give you a headache🙂
Originally posted by Grampy BobbyThe most important factor, is the distance of the earth from the sun. It has to be within the Goldilocks zone. There are three planets within that zone, Venus, Earth and Mars.
twhitehead, my interest in this context is learning what mechanisms [for lack of a better word] make earth habitable.